Now, just for fun, I stuck in my old Ubuntu Saucy Salamander disk and booted
the machine, installed Ubuntu, and without creating any partitions. I just
wiped all the old partitions out and used the entire drive for Ubuntu -- so
the partition manager said at install.
Guess what? It didn't work. When all the installing was done, I rebooted
from Quirky to see what partitions are on the drive, and sda1, sda5, and sda2
are still on the partition. Ubuntu simply installed over Trisquel and left
the partitions alone. I did the same things with both a Puppy and a Quirky
install, and the partitions are left alone again. Gparted still says it
can't do anything to delete a mounted partition--even though, according to
the partition itself, -- it isn't mounted!
Can't zap this "sda5" nonsense. That's the key here. Got to find the way to
be rid of that. It's just messin' everything up.